The South Arturo Mine is located in the northern end of the Carlin Trend, a 40 mile-long north-northwest alignment of sedimentary rock-hosted gold deposits. These deposits are generally known as Carlin-type deposits named after the Carlin deposit. More than 50 million ounces of gold have been mined from the Carlin Trend since 1980. Characteristically, the gold mineralization in the Carlin-type gold deposits is dispersed, micron-sized, and found commonly on the rims of pyrite grains in predominately carbonate-bearing host rocks. Decalcification, silicification, and dolomitization are the most dominant alteration features. Generally, there is negligible base metal content, low silver to gold ratios, and a geochemical enrichment in arsenic, antimony and mercury. The South Arturo gold-silver deposits can be divided into five mineralized areas. These areas are the South Arturo, West Button Hill, Southwest Dee pit, Deep North, and Hinge. The majority of these deposits are classified as “Meikle Type” breccia hosted Carlin type deposits. A complex set of breccias occur at the upper contact of the Bootstrap limestone. These breccias can be generalized into four basic types: silicified heterolithic breccias, silica-Sulfide breccia, dolomite breccia, and cavity- fill breccias. While mineralization is widespread throughout the South Arturo Mine area, localized high-grade gold mineralization drives the economics and mine locations. South Arturo The northern extent of South Arturo minera ........

The Carlin Complex has four major open pit operations including Goldstrike, Gold Quarry, Goldstar (part of the Genesis/Tri-Star pits), and South Arturo (which returned to production in December 2022).

The South Arturo Project includes the completed east lobe Phase 2 (Button Hill) open pit and the active El Niño underground mine at the bottom of the Phase 2 pit.

The open pits are mined with a conventional shovel/truck operation. The mining equipment fleet and support infrastructure is shared with Goldstrike.

Mining benches are 20-feet high in mineralized areas and 40 feet in waste. Haulage ramps have a maximum gradient of +/-10% and are 140-feet wide including the safety berm. Single lane ramps are 80-feet wide and are planned for the very lowest benches. The minimum mining width is 350-feet.

The mine operates 24 hours per day 7 days a week. Total material moved per day averages 135,000 tons with both shovels operating.

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